Z3 why not Rapid AF?

As stated in the FAQ of the KM G400 on the KM site, which also has passive external "rapid AF" sensors, they only start to work above xx lux. So probably only outside when it's good whether. Try your trick there, it might make a difference.

Bob877
wrote:

For what it's worth I've tried covering and uncovering that window
with my finger on 2 Z1s and so far as I can tell it never made any
difference.
--
Bob